Alma's great at beatboxing so good that she thinks she doesn't need to practice with Eddie and Becka before their backyard show. She finds out the hard way that practice makes perfect when she ruins the performance. Alma wants to be a "super sister" to Junior, just like Tia Gloria is to Mami. But when Junior doesn't seem happy with her not-so-super deeds, Alma must figure out what being a "super sister" really means.